Filters-Imaging

Celestron Oxygen III Narrowband Filter - 2in   The 2" OIII narrowband filter isolates just the two doubly-ionized oxygen lines (496 and 501 nm lines) emitted by planetary and emission nebulae, while blocking the rest of the overall spectrum of light...

Optolong Variable Polarizer 1.25in Filter

Optolong Moon and SkyGlow 2in Filter Designed to darken the background sky by blocking light transmission from skyglow 589nm and many street light emissions from artificial light. 

Baader Planetarium Semi-APO Filter 2in

Baader Planetarium Polarization Filter, 2in Double

Baader Planetarium Polarization Filter, 1.25in Double

Baader Planetarium Polarization Filter, 1.25in Single Baader Polarizing Filter Screws into 1¼ or 2" eyepieces/threads. Useful in Lunar and Solar observations to limit brightness and increase contrast. The filter can also be used with a Baader...

Baader Planetarium O-III Nebula Filter, 1.25in Visual

Baader Planetarium Neutral Density Filter 2in, Multicoated / ND 1.8

Baader Planetarium Neutral Density Filter 2in, Multicoated / ND 0.9

Baader Planetarium Fringe-Killer Filter, 1.25in

Baader Planetarium Narrowband S-II (8nm) CCD-Filter, 2in (with LPFC)

Baader Planetarium Narrowband O-III (8.5nm) CCD-Filter, 2in (with LPFC)

Baader Planetarium f/2 Highspeed-Filter H-Alpha 2in (with LPFC) NEW

Baader Planetarium BCF Corrector Filter for Canon EOS 7D/40D/50D/60D/400D/450D/500D/550D/600D/650D/1000D/1100D

Optolong L-eXtreme 2in Filter   L-eXtreme is a two 7nm bandpass filter which can be used with one-shot color cameras like DSLR's (digital SLR), and monochrome CCD cameras, it is also more suited for fast systems. The convenience and cost...